Gunpowder punching-machine



T. SHAW. Gun-Powder Punching-Machine.

Patented Jan. 20, 1880 k: n

WITNESSES: INVENTOR W: Gum/ML ATTORNEY I UNITED STATES PATENT OFFICE.

THOMAS SHAW, OF PHILADELPHIA, PENNSYLVANIA.

GUNPOWDER PUNCHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 223,767, dated January20, 1880.

Application filed November 23, 1878.

' To all whom z't may concern Be it known that I, THOMAS SHAW, of thecity and county of Philadelphia, Pennsylvania, have invented a new andImproved Gunpowder Punching-Machine and Ihereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, -and to the letters of reference markedthereon.

My invention consists in the production of a machine actuated byexplosive compounds in a confined chamber, that forcibly ejects a pistonor plunger, to which is secured the desired punch or other tool that isto out, impress, or shear metal or other material requiring great forceto act upon the same, the prin= cipal features of which are constructedand operated in the manner and for the purpose as hereinafter described.

The object of the invention is to furnish a compact powerful machine toperform the maximum labor, limited in its giant strength only by thestrength of the material of which it is composed.

In order to enable others to use and practice my invention, I willproceed to describe its construction and operation.

On reference to the accompanying drawings, which form part of thespecification, Figure l is a vertical section through the center of themachine, and Fig. 2 is a cross-section on the line 1 and 2 5 and Fig. 3is a top view of the same.

Similar letters refer to similar parts, of whichA is the cylinder orbody of the machine, bored in the center forthe reception of plunger B,die E, and thrust-ring F, and has a cross-aperture, K, for the insertionof bars of metal to be acted upon. H isthe explosionchamber, providedwith an aperture on the top for the insertion of explosive compounds,which aperture is closed by plug 0, which plug has a central borethroughout its entire length for the insertion of the firing-pin I,which projects above the plug 0 at the top, and is provided with anenlarged head at the bottom, to prevent blowing the pin out of the plug.There is a slight concavity in the top of plunger B, in which theexplosive powder falls, and on which the pin I rests preparatory todischarging the compound. The plunger B has a throughbolt, L, thatprojects beyond both sides of cylinder A, which cylinder is slotted forits reception and operation. The outer ends of said bolt L are graspedby strong springs D, the upper ends of said springs being secured bybolts G to the outside of cylinder A, and the tension of the springs isto close plunger 13 back into the cylinder from which it is expelled bythe explosive force.

The plunger B, Fig. 2, is provided with channel-ways N, to exhaust thepressure after the plunger'B has traveled the length of theexplosion-chamber H.

J shows a punch secured to plunger B in any of the ordinary methods ofsecuring punches to punching-machines. over the die E, for the receptionof the same, and any forcible downward movement of plunger B will punchfrom any bar or plate a hole of the configuration of said punch. Thepunch can be variously fashioned, and shear-blades or othermetal-working devices can be secured to said plunger B, and other diessubstituted in place of the one shown at E by any of the common methodsof securing said dies or other metal-working devices, all of which canbe forcibly operated by said plunger B, as hereinafter explained.

O is a cushion of elastic material, to overcome the final momentum ofplunger B after the necessary stroke is terminated. The plug 0 is heldin place byscrew-thread on the entire or part of its length, or can beheld by ordinary cam-grooves.

The machine is operated in this manner: The screw-plug O is removed, anda small portion of percussion material or powder is inserted or allowedto drop upon the top of plunger-head B in the explosion-chamber H; Whenthe plug (3 is inserted or placed in a resisting position to prevent itsbeing blown out, the material to be operated upon is inserted beneaththe punch J of plunger B. The pin I is struck with a hammer or otherobject on the top at I, which causes the percussion material to igniteand create a great pressure in chamber H, which forcibly ejects plungerB and resists obstructions beneath the same, cutting or squeezingmaterial according to the shape and fashion of the dies employed. Thisforce continues until the gas exhausts itself from the The punch J islocated channels N, Fig. 2, on the completion of the stroke of chamberH, when a similar charge of percussion material is inserted and a likeoperation performed, as afore describech'the springs D insuring a returnstroke.

The machine is intended for such laborious duty that each blow will havesufficient telling eifect as to warrant its employment on several kindsof metal-work.

It will be evident that this machine can be variously modified andfashioned without any alterations in the result. I therefore do not wishto confine myself to the exactmachine set forth.

What I claim, and desire to secure by Letters Patent, is-

1. The combination of the hollow cylinder -A, the die E, plunger B, andthe elastic cushion O, as and for the purpose specified.

3. The combination of the hollow cylinder A, the plunger B, with itsexplosion-chamber H, the plug 0, and pin I, as and for the purpose setforth.

THOMAS SHAW.

Witnesses: v

ELIAS J. SHAW, -WM. GARWOOD.

